A detachable waste removal mechanism for a flexographic printing press

Abstract

The application belongs to the technical field of printing equipment, and particularly relates to a detachable waste discharge mechanism applicable to a flexographic printing machine. The structure of the detachable waste discharge mechanism comprises a middle support frame body unit, a rotating shaft unit which is inserted and arranged on the middle support frame body unit and used for winding and recovering two turns of side waste of a printing material, and two sleeve type support frame body units which are arranged at two side positions of the middle support frame body unit, support the rotating shaft unit, and are used for transversely detaching and taking off the side waste of the printing material through a downward retraction mode.

Description

Technical Field

[0001] This application belongs to the field of printing equipment technology, and in particular relates to a detachable waste removal mechanism that can be used in flexographic printing machines. Background Technology

[0002] A flexographic printing press is a type of printing equipment that uses flexible printing plates. It is widely used for printing on non-absorbent and absorbent materials such as paper, plastic film, metal foil, and self-adhesive labels.

[0003] Common flexographic printing presses typically consist of an unwinding unit, a printing unit, a drying unit, and a rewinding unit. The general principle of a flexographic printing press is based on ink transfer and printing pressure. Ink transfer refers to the uniform application of ink to the image areas of the flexible printing plate via ink fountain rollers and anilox rollers. Printing pressure refers to the pressure applied by the impression cylinder, which transfers the ink from the printing plate to the substrate surface, forming a clear image.

[0004] On the other hand, the flatness of the sides of the roll material used for flexographic printing may not meet the requirements of the flexographic printing process. Therefore, a side trimming mechanism and a waste removal mechanism can be set between the unwinding unit and the printing unit, the latter being used to wind up and recycle the cut sides of the roll material.

[0005] For example, Chinese utility model patent with authorization announcement number CN 220866675U and authorization announcement date of April 30, 2024 discloses a waste discharge device for a flexographic printing machine. Its main structural components include: a left guide column, a left slide, a right guide column, a lead screw, a lead screw nut, a right slide, a take-up roller, a first motor, and a second motor.

[0006] The advantages of the waste removal device for flexographic printing machines in this utility model patent are: as the diameter of the take-up roller increases, its vertical height also increases to prevent the take-up waste from contacting the ground, and to ensure that the take-up roller is in a low position when disassembling, which is conducive to disassembly.

[0007] However, in actual use, the disassembly function of this flexographic printing machine's waste removal device still has some shortcomings in practicality, specifically:

[0008] The waste material on the side of the printing substrate wound on the take-up roller is difficult to remove from the take-up roller alone. The main reason for this is the obstruction effect of the slides on both sides. Utility Model Content

[0009] This application provides a detachable waste removal mechanism for flexographic printing presses. The technical problem to be solved is: how to make the detachable waste removal mechanism for flexographic printing presses allow the waste material that has been wound into a coil to be easily removed individually.

[0010] The technical solution adopted by this application to solve the above problems is: a disassembly-type waste removal mechanism that can be used in flexographic printing machines, the structure of which includes a central support frame unit, a rotating shaft unit that is inserted into the central support frame unit and whose two ends are respectively used to wind and collect two turns of waste material from the side of the printing material, and two socketed support frame units that are respectively located on both sides of the central support frame unit, support the rotating shaft unit, and are used for lateral disassembly and removal of waste material from the side of the printing material by retracting downward.

[0011] A further preferred technical solution is that the central support frame unit includes two vertical support plates and mounting holes disposed on the vertical support plates for inserting the rotating shaft unit.

[0012] A further preferred technical solution is that the rotating shaft unit includes a take-up roller inserted into the two mounting holes, and a drive wheel disposed on the take-up roller and located between the two vertical support plates.

[0013] A further preferred technical solution is that the socket-type support frame unit includes a lower upright plate, an upper lifting plate disposed on the lower upright plate and used to laterally block the waste material on the side of the printing material when it is being wound, a socket groove disposed on the lower surface of the upper lifting plate and used to insert into the lower upright plate, and a vertical slot disposed on the upper surface of the upper lifting plate and used to support the take-up roller.

[0014] A further preferred technical solution is that the rotating shaft unit further includes two limiting rings sleeved on the winding roller and used to block and limit the opposite sides of the two vertical support plates.

[0015] A further preferred technical solution is that the rotating shaft unit further includes a receiving groove disposed on the take-up roller and used to insert and fix the end position of the waste material on the side of the printing substrate.

[0016] A further preferred technical solution is that the rotating shaft unit further includes an inner tube sleeved on the take-up roller and located on the same side between the vertical support plate and the upper lifting plate, and used to laterally slide and remove the side waste of the printing material by winding around the waste material on the side of the printing material.

[0017] A further preferred technical solution is that the rotating shaft unit further includes a longitudinal tangent disposed on the take-up roller and used to circumferentially fix the drive wheel.

[0018] A further preferred technical solution is that the rotating shaft unit further includes a fastening bolt disposed on the limiting ring and used to clamp the take-up roller inward, and embedded balls disposed on the side plane of the limiting ring and used to roll and rub the vertical support plate.

[0019] A further preferred technical solution is that the socket-type support frame unit further includes a fixing hole provided on the lower upright plate, and a fixing bolt provided on the upper lifting plate and used to insert into the fixing hole.

[0020] The beneficial effects of this application include at least the following three points.

[0021] First, in response to the specific winding method of waste material on the side of the printing substrate, the main installation structure of the rotating shaft unit, namely the middle support frame unit, is set in the center position, and the socket-type support frame unit is set to be retractable downwards. This allows the waste material that has been wound into a circle to be disassembled and removed laterally, making its recycling method more flexible and making the method of completely cutting it open for recycling no longer the only option.

[0022] Secondly, when the waste material on the side of the printing substrate is wound and recycled on the rotating shaft unit, it has the dual advantages of precise lateral positioning and stable circumferential power input.

[0023] Third, the rotating shaft unit, through the inner tube, makes it easier and less strenuous to remove the already coiled waste material laterally, and it retains the coiled shape after removal, making it convenient for subsequent reprocessing and utilization. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this application.

[0025] Figure 2 This is a schematic diagram showing the location of waste material on the side of the printing substrate in the prior art.

[0026] Figure 3 This is a schematic diagram showing the installation location of this application in a flexographic printing system.

[0027] Figure 4 This is a schematic diagram of the location and structure of the central support frame unit in this application.

[0028] Figure 5 This is a schematic diagram of the downward retraction method of the socket-type support frame unit in this application.

[0029] Figure 6 This is a schematic diagram of the rotating shaft unit in this application.

[0030] Figure 7 This is a schematic diagram showing the location of the waste material on the side of the two rings of printing material in this application.

[0031] Figure 8 This is a schematic diagram illustrating the usage of the receiving tank in this application.

[0032] Figure 9 This is a schematic diagram showing the position of the embedded ball bearings in this application.

[0033] Figure 10 This is a schematic diagram of one shape of the inner tube in this application.

[0034] The meanings of the markings in the diagram are as follows.

[0035] a) Side waste of printing material, b) Trimming position, c) Unwinding roller, d) Rewinding roller, e) Printing unit, f) Drying unit, g) Cutting position;

[0036] Central support frame unit 1, rotating shaft unit 2, sleeve-type support frame unit 3, base plate 4, pulley 5, conical wheel 6;

[0037] Vertical support plate 101, mounting hole 102;

[0038] 201 winding roller, 202 drive wheel, 203 limiting ring, 204 receiving groove, 205 inner tube, 206 length tangential surface, 207 fastening bolt, 208 embedded ball, 209 inner tube cutout;

[0039] The lower upright plate 301, the upper lifting plate 302, the sleeve groove 303, the vertical slot 304, the fixing hole 305, and the fixing bolt 306. Detailed Implementation

[0040] The following description is merely a preferred embodiment of this application and is not intended to limit the scope of this application.

[0041] like Figures 1-10 As shown, a detachable waste removal mechanism for flexographic printing machines includes a central support frame unit 1, a rotating shaft unit 2 inserted into the central support frame unit 1 and with both ends used for winding and collecting two turns of waste material a from the side of the printing material, and two socketed support frame units 3 respectively located on both sides of the central support frame unit 1, supporting the rotating shaft unit 2, and retracting downwards for laterally disassembling and removing the waste material a from the side of the printing material.

[0042] In this embodiment, the term "detachable" has the following two meanings.

[0043] First, the waste material a on the side of the printing material that has been wound into a circle on the rotating shaft unit 2 can be removed horizontally on the rotating shaft unit 2 in a relatively simple and convenient way. The recycling method of the waste material a on the side of the printing material is more flexible, and the recycling method of cutting the waste material completely is no longer the only option.

[0044] Secondly, the disassembly and removal of the rotating shaft unit 2 is also relatively simple, which is conducive to its maintenance and replacement.

[0045] The central support frame unit 1 and the socket-type support frame unit 3 are both fixed to the base plate 4. The printing material is roll paper or film. The side waste material a of the printing material is wound relatively close to the side on the rotating shaft unit 2, and there are two of them. The power input position of the rotating shaft unit 2 is relatively central, thereby avoiding the waste material that has been wound into a large circle from squeezing the drive structure of the rotating shaft unit 2.

[0046] In addition, when the waste discharge mechanism is in normal use, the sleeve-type support frame unit 3 is in an upward unfolded state. Its function is to support the end position of the rotating shaft unit 2, so as to prevent the relatively heavy large circle of waste material from significantly bending the end position of the rotating shaft unit 2.

[0047] When the waste discharge mechanism is not in use, the socket-type support frame unit 3 is in a retracted state. Its function is to avoid blocking the waste material a on the side of the printing material that needs to be disassembled and removed horizontally, so that the recycling method of the waste material is not limited to cutting.

[0048] Finally, the main body of the waste removal mechanism is made of stainless steel, engineering plastic, or aluminum alloy, and the waste material on the side of the printing material (a) is the relatively outer area of ​​the two trimming positions (b). Generally, the waste material on the side of the printing material (a) is generated continuously. If it falls off accidentally, the operator needs to manually rewrap the broken end around the rotating shaft unit 2.

[0049] The central support frame unit 1 includes two vertical support plates 101 and mounting holes 102 disposed on the vertical support plates 101 for inserting the rotating shaft unit 2.

[0050] In this embodiment, the number of the central support frame unit 1 is one, which includes two parallel, rectangular vertical support plates 101, each of which is provided with one mounting hole 102.

[0051] The mounting hole 102 is a circular hole, and bearings or balls can be installed on it to make the rotation of the rotating shaft unit 2 more stable and less labor-intensive.

[0052] The rotating shaft unit 2 includes a take-up roller 201 inserted into the two mounting holes 102, and a drive wheel 202 disposed on the take-up roller 201 and located between the two vertical support plates 101.

[0053] In this embodiment, the first shape of the take-up roller 201 is cylindrical, with a length of 1.5-2.0m, which is wider than the width of the commonly used roll paper or film, ensuring that the two strips of printing material side waste a can be effectively wound into a loop on the take-up roller 201.

[0054] The drive wheel 202 can be either a belt pulley or a gear, and one of its connection methods can be:

[0055] The drive wheel 202 is on top and the pulley 5 is on the bottom. The pulley 5 and the conical wheel 6 are coaxial. The conical gear on the drive motor meshes with the conical wheel 6. The drive wheel 202 and the pulley 5 are provided with belts, so that the drive motor can ultimately control the rotation of the take-up roller 201.

[0056] Correspondingly, the pulley 5, the conical wheel 6, and the drive motor are all positioned between the two vertical support plates 101 to prevent the waste material a on the side of the printing material with gradually increasing diameter from accidentally touching the drive motor.

[0057] The socket-type support frame unit 3 includes a lower upright plate 301, an upper lifting plate 302 disposed on the lower upright plate 301 and used to laterally block the waste material a on the side of the printing material when it is being wound, a socket groove 303 disposed on the lower surface of the upper lifting plate 302 and used to insert into the lower upright plate 301, and a vertical slot 304 disposed on the upper surface of the upper lifting plate 302 and used to support the take-up roller 201.

[0058] In this embodiment, the lower upright plate 301 and the upper lifting plate 302 are both generally rectangular. The socket groove 303 can either vertically penetrate the upper lifting plate 302. If it does, the advantage is that the downward retraction range of the upper lifting plate 302 can be relatively large, providing more vertical space for the lateral disassembly and removal of the waste material a from the side of the printing material.

[0059] If the socket groove 303 is not through, the advantages are: First, the structural strength of the upper lifting plate 302 can be relatively large, which can more stably support the take-up roller 201; Second, the bottom surface of the vertical slot 304 is relatively large, and a sufficient and appropriate number of balls can be set on it, so that the take-up roller 201 has the advantage of relatively low resistance in rotation on the vertical slot 304.

[0060] In addition, the vertical slot 304 includes a semi-circular bottom surface to fully support the take-up roller 201, and its opening size is relatively large to ensure that the take-up roller 201 can be moved out of the vertical slot 304.

[0061] The rotating shaft unit 2 also includes two limiting rings 203 that are sleeved on the take-up roller 201 and are used to block and limit the opposite sides of the two vertical support plates 101.

[0062] In this embodiment, the relative fixation relationship between the drive wheel 202 and the take-up roller 201 is mainly circumferentially fixed to ensure effective power input. However, unlike this embodiment, the relative fixation relationship between the limiting ring 203 and the take-up roller 201 is mainly longitudinally fixed to prevent unnecessary lateral displacement of the take-up roller 201 along with the waste material a on the side of the printing material.

[0063] The rotating shaft unit 2 also includes a receiving groove 204 disposed on the take-up roller 201 and used to insert and fix the end position of the waste material a on the side of the printing material.

[0064] In this embodiment, the end of the waste material a on the side of the printing material can be folded multiple times to obtain a relatively large thickness, so that it can be effectively inserted into and fully locked in the receiving groove 204. This makes the winding action of the waste material a on the side of the printing material more stable and avoids the harmful phenomenon of waste material falling off in the early stage of winding.

[0065] The receiving groove 204 is rectangular in shape, with an opening length of 0.5-0.8m, an opening width of 1-2cm, a depth of 2-4cm, and a quantity of 2, corresponding to the two winding positions of the waste material a on the side of the printing material.

[0066] The rotating shaft unit 2 also includes an inner tube 205 that is sleeved on the take-up roller 201 and located on the same side between the vertical support plate 101 and the upper lifting plate 302, and is used to laterally slide off the side waste material a by winding around the side waste material a of the printing material.

[0067] In this embodiment, when the waste material a on the side of the printing material is first wound on the take-up roller 201 and then slid laterally and removed, it may face the harmful problem of relatively large sliding resistance, making it relatively difficult to remove.

[0068] Therefore, the inner tube 205 is fitted onto the take-up roller 201, serving as the actual central axis when the waste material a on the side of the printing material is wound, ensuring that the above-mentioned removal action is relatively labor-saving.

[0069] Correspondingly, the waste discharge mechanism can be equipped with 4-8 inner tubes 205, with 2 used at a time. Similar to the drive wheel 202, the inner tube 205 and the take-up roller 201 also need to be circumferentially fixed to ensure that they can rotate synchronously.

[0070] Furthermore, an inner tube cutout 209 can be provided on the inner tube 205, which functions similarly to the receiving groove 204. The starting end of the winding of the waste material a on the side of the printing material can be inserted into the inner tube cutout 209 and plugged and fixed in the gap between the inner tube 205 and the take-up roller 201.

[0071] On the other hand, the inner tube cutout 209 can also be used in conjunction with the receiving groove 204. The former is only used to pass through the above-mentioned winding start end. The end is still inserted and fixed on the receiving groove 204. Both can make the waste material a on the side of the printing material start to rotate and wind stably.

[0072] The rotating shaft unit 2 also includes a length tangent 206 disposed on the take-up roller 201 and used to circumferentially fix the drive wheel 202.

[0073] In this embodiment, the length of the longitudinal section 206 is equal to the length of the take-up roller 201, and its main function is:

[0074] The inner ring surfaces of the drive wheel 202 and the inner tube 205 are provided with engaging protrusions that match the length-direction tangential surface 206, thereby making it difficult for the two to slip and ensuring that they always rotate together with the take-up roller 201.

[0075] The rotating shaft unit 2 further includes a fastening bolt 207 disposed on the limiting ring 203 and used to clamp the take-up roller 201 inward, and an embedded ball bearing 208 disposed on the side plane of the limiting ring 203 and used to roll and rub the vertical support plate 101.

[0076] In this embodiment, it is not necessary to provide the above-mentioned engaging protrusion on the inner ring surface of the limiting ring 203, because its main function is to fix the winding roller 201 in the length direction, rather than in the circumferential direction.

[0077] When the waste discharge mechanism is in normal use, the fastening bolt 207 clamps the take-up roller 201 inward, and the embedded ball bearing 208 abuts against the opposite side of the vertical support plate 101, thereby enabling the take-up roller 201 to rotate stably and with low resistance.

[0078] When the take-up roller 201 in the waste discharge mechanism needs to be removed, first remove the two fastening bolts 207, and then pull it out horizontally. At this time, there is no obvious lateral resistance between the drive wheel 202 and the take-up roller 201, between the limit ring 203 and the take-up roller 201, and between the mounting hole 102 and the take-up roller 201.

[0079] The socket-type support frame unit 3 also includes a fixing hole 305 provided on the lower upright plate 301, and a fixing bolt 306 provided on the upper lifting plate 302 and used to insert into the fixing hole 305.

[0080] In this embodiment, at least one of the fixing hole 305 and the opening on the upper lifting plate 302 for installing the fixing bolt 306 can be a screw hole. When the fixing bolt 306 is inserted into the fixing hole 305, the bottom surface of the vertical slot 304 provides sufficient and suitable support for the take-up roller 201.

[0081] Finally, this detachable waste removal mechanism can also be used in various other printing equipment such as inkjet printers and laser printers, as long as the printing materials such as roll paper and film used by the above equipment have the possibility of uneven edges.

[0082] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this application. These are non-inventive modifications and are protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. A detachable waste removal mechanism for use in flexographic printing presses, characterized in that: The structure includes a central support frame unit (1), a rotating shaft unit (2) inserted into the central support frame unit (1) and with both ends used for winding and recycling two turns of the side waste material (a) of the printing material, and two socketed support frame units (3) respectively located on both sides of the central support frame unit (1), supporting the rotating shaft unit (2), and retracting downwards for laterally disassembling and removing the side waste material (a) of the printing material.

2. The detachable waste removal mechanism for flexographic printing machines according to claim 1, characterized in that: The central support frame unit (1) includes two vertical support plates (101) and mounting holes (102) provided on the vertical support plates (101) for inserting the rotating shaft unit (2).

3. A detachable waste removal mechanism for flexographic printing presses according to claim 2, characterized in that: The rotating shaft unit (2) includes a take-up roller (201) inserted into the two mounting holes (102) and a drive wheel (202) disposed on the take-up roller (201) and located between the two vertical support plates (101).

4. A detachable waste removal mechanism for flexographic printing presses according to claim 3, characterized in that: The socket-type support frame unit (3) includes a lower upright plate (301), an upper lifting plate (302) disposed on the lower upright plate (301) and used to laterally block the side waste (a) of the printing material when it is wound, a socket groove (303) disposed on the lower surface of the upper lifting plate (302) and used to insert into the lower upright plate (301), and a vertical slot (304) disposed on the upper surface of the upper lifting plate (302) and used to support the take-up roller (201).

5. A detachable waste removal mechanism for flexographic printing presses according to claim 3, characterized in that: The rotating shaft unit (2) also includes two limiting rings (203) sleeved on the take-up roller (201) and used to block and limit the opposite sides of the two vertical support plates (101).

6. A detachable waste removal mechanism for flexographic printing presses according to claim 3, characterized in that: The rotating shaft unit (2) also includes a receiving groove (204) disposed on the take-up roller (201) and used to insert and fix the end position of the side waste material (a) of the printing material.

7. A detachable waste removal mechanism for flexographic printing presses according to claim 4, characterized in that: The rotating shaft unit (2) also includes an inner tube (205) sleeved on the take-up roller (201) and located on the same side between the vertical support plate (101) and the upper lifting plate (302), and used to laterally slide off the side waste material (a) of the printing material by winding around the side waste material (a).

8. A detachable waste removal mechanism for use in a flexographic printing machine according to claim 3, characterized in that: The rotating shaft unit (2) also includes a length tangent (206) disposed on the take-up roller (201) and used to circumferentially fix the drive wheel (202).

9. A detachable waste removal mechanism for use in a flexographic printing machine according to claim 5, characterized in that: The rotating shaft unit (2) further includes a fastening bolt (207) disposed on the limiting ring (203) and used to clamp the take-up roller (201) inward, and an embedded ball (208) disposed on the side plane of the limiting ring (203) and used to roll and rub the vertical support plate (101).

10. A detachable waste removal mechanism for use in a flexographic printing machine according to claim 4, characterized in that: The socket-type support frame unit (3) also includes a fixing hole (305) provided on the lower upright plate (301) and a fixing bolt (306) provided on the upper lifting plate (302) for inserting into the fixing hole (305).

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